noun 1. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere. /ˈhaɪdrəˌsfɪə/noun 1. the watery part of the earth’s surface, including oceans, lakes, water vapour in the atmosphere, etc n.

1887, from hydro- + sphere. hydrosphere (hī’drə-sfîr’) All of the Earth’s water, including surface water (water in oceans, lakes, and rivers), groundwater (water in soil and beneath the Earth’s surface), snowcover, ice, and water in the atmosphere, including water vapor. Compare asthenosphere, atmosphere, lithosphere.

[hahy-druh-stat] /ˈhaɪ drəˌstæt/ noun 1. an electrical device for detecting the presence of water, as from overflow or leakage. 2. any of various devices for preventing injury to a steam boiler when its water sinks below a certain level. /ˈhaɪdrəʊˌstæt/ noun 1. a device that detects the presence of water as a prevention against drying […]

hydrostatic pressure (hī’drə-stāt’ĭk) The pressure exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.

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